Paving-mixing machine.



5 SHEETS-SHEET I.

INVENTOR W F. DAVIS.

PAVING MIXING MACHINE.

APPLlCATlON FILED 1UNE15, 1914A Patented Apr. 17, 1917.

W. F. DAVIS.

PAVING MIXING MACHINE.

APPLICATION FILED JUNE I5, I914.

Patented A pr. 17, 1917.

5 SHEETS-SHEEI 2.

INVENTOR W. F. DAVIS.

PAVING MIXING MACHINE.

APPLICATSON FILED JUNE x5. 1914.

lntmfiod Apr. 17, 1917.

WITNESSES:

W.- F. DAVlS.

PAVING MIXING MACHINE.

1 APPLICATION FILED JUNE 15, 1914. 1,222,605 Patented Apr. 11, 1917.

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w. F'. DAVIS.

PAVING MIXING MACHINE.

APPLICATION FILED JUNE I5. I9I4.

1,222,6U5, Patented Apr. 17, 1917.

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WILLIAM F. DAVIS, OF KANSAS CITY, MISSOURI.

PAVING-MIXING lWACI-IINE.

Application filed June 15, 1914.

To all whom it may concern:

Be it known that I, \VILLIAM F. DATS, a citizen of the United States, residing in Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Paving- Mixing Machines, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same.

The invention relates to certain improvements in machines for mixing asphalt and other binders with earth, soil, sand, crushed Stone and the like, for the purpose of producing a tough water proof mass for paving streets, road ways and the like.

The details set forth hereinafter are improvements in the construction of certain machines embodied in Letters Patent Number 1.020.6i0, issued to the present applicant March 19th, 1912, and Letters Patent Number 1,044,999, issued to him Nov. 19th, 1912, the improvements of the present application having been constructed and operated in the construction of paving for public highway, and all claims as to operation hereinafter have been proven by practice.

The present invention has provided an improved machine of light weight and large capacity with improved means of regulating the quantity of material and the quantity of asphalt or binder, so that any desired mixture can be accurately gaged and made with less care and attention than formerly.

A further object of the invention is to provide means for automatically lifting the rotary scraper over large stones and the like, so that rigid scraping edges may be employed, the advantage being a more durable scraper.

A still further object of the invention is to provide means for working or kneading the material as it is discharged from the rotary scraper so as to set the asphalt or binder in soil or earthy material while the binder is hot, to prevent the binder from shrinking away from the material in case the product is not spread and rolled immediately after the mixture.

A still further object is to provide means for heating the projections of the rotary scraper, so that wet, sticky material may be worked without waiting for the material to dry.

Specification of Letters Patent.

Patented Apr. 317, 191?.

Serial No. 845,116.

Throughout the specification and in the claims appendedthe word binder is used to designate asphalt, bitumen or cement, or any hinder or water proofing which may be applied to paving material, and the word material is used to indicate earth, soil, sand, stone or any material that may be employed to form the body or major portion of paving or road surfacing product.

With these and other objects in view, the invention consists in the features of con struction. combinations and arrangements of parts hereinafter set forth, illustrated in the accompanying drawings and more particularly pointed out in the appended claims.

In the drawings:

Figure 1 is a side elevation view of a machine embodying the improvements.

Fig. 2 is a view in side elevation of the machine with certain parts broken away and other parts removed, this view and all following views being on an enlarged scale, all of which are the same scale.

Fig. 3 is a plan view of the machine with certain parts broken away and other parts removed.

Fig. 1 is a plan view of a part of the machine which is omitted in Fig. 3, the views joining on line aa of Fig. 8 and line Z2 4) of Fig. i.

Fig. 5 is a vertical section of the machine taken on line cc of Fig. 3, with certain parts broken away and other parts removed, the direction being indicated by arrow 1.

Fig. (5 is a vertical section of the parts illustrated in Fig. 4, the view being taken on line f-f of Fig. i, and the lines (Z(Z of Fig. 6 and e@ of Fig. representing the same location.

Fig. 7 is a view in end elevation with cer tain parts broken away and the parts shown in Figs. 4 and 6 removed.

Fig. 8 is a vertical section taken on line of Fig. 3 looking in the direction of arrow ll.

Fig. 9 is a fragmentary vertical cross section taken on line 7z/z, of Fig. 3, looking in the direction of arrow HI.

Fig. 10 is a fragmentary vertical longitudinal section taken on line iz' of Fig. 3. looking in the direction of arrow IV.

Fig. 11 is a fragmentary cross section taken on line 7'. of Fig.2, lookingin the direction of arrow V.

Fig. 12 is a fragmentary vertical cross section taken on line 7c7c of Fig. 2, looking in the direction of arrow VI.

For convenience in handling and operating, the machine is mounted on a truck of ordinary construction comprising angles 1 secured together by cross angles 2 and 3 and supported by wheels 4 and 5, the platform 6 being secured to the angles 1 to support the engine 7, which has a shaft 8 and a pulley 9, these being also conjunctional equipment of the machine.

' The asphalt melting tank 10 is also conjunctional and is provided with feet 11, which rest on cross angles 2, by which the tank is supported.

The channels 12 are secured together by cross ties 13, connected with bolts 14, are supported by legs 15 and 16, secured to the channels by bolts 17, the upper ends of the legs being tied and stiffened by cross members 18 connected by bolts 19, and the lower ends of the legs resting on cross angles 3 by which they are supported.

To the cross ties 13 are secured by bolts 20 rails 21 on which roll the wheels 22, the lat ter being provided with flanges 23 which fit between the rails. \Vheels 22 are journaled on axles 24 of the conveying cups 25 and guide and support the cups along the rails 21 in a true straight line, the cups being preferably as shown, rectangular in shape, with closed bottoms, side walls 47, and open endwise and upward, the cups forming as they pass along the rails 21 an open trough.

Cups are hingedly connected and form an endless conveyer which is driven by wheels 26 from shaft 27, the opposite end of the conveyer being guided upward and on to the rails 21 by wheels 28 mounted on shaft 29, the shaft 27 being journaled in boxes 30 on the legs 16, while shaft 29 is journalcd in adjustable boxes 31, mounted in jaw; 32 of the legs 15, and adjusted by screws 33 to keep the conveyer in proper working adjustment.

Fitting over the cups 25 is the hopper 34, the bottom 45 opening into the top of the cups, and the wall 35 extending down into the cups to prevent the material to be mixed from escaping from the corresponding end of the hopper, the conveyer running in the direction of arrow 36. The end 37 of the hopper 34 is cut away to the interior width of the cups 25 for some distance above the top of the cups as illustrated in Fig. 5, and a pair of side plates 38 extend from the hopper to and beyond the roller 39, the outer end being held from spreading by bolt 40. Roller 39 is rigid with shaft 41, which is journaled in the swinging arm 42, the latter being pivoted on shaft 43, which in turn is fitted in housings 44 so that the roller is free to swing up and down as more or less material is fed to the conveyer, the housing being secured to channels 12, the travel of the conveyer containing material being sufficient to drive the roller 39.

The shearing scraper 46 is pivoted to swing on shaft 43 with the edge 48 lying across the cups 25 between the side walls 47 of cups 25, the scraper extending upward and forming a moldboard 49 which slants toward the return elevator 50, the action being the same as that of any ordinary plow, the elevator being for the purpose of conducting the removed material which is cut from that rolled by the roller 39 to the hopper 34, where it may again be fed into the conveyer cups 25.

The elevator 50 is secured to one of the housings 44 by bolt 51, the upper end being supported by bracket 52 from end wall 37 0f the hopper 34, the chain 53 and cups 54 being driven by shaft 55, sprocket 56, chain 57 and sprocket 58, the latter being mounted on shaft 29, it being obvious that shaft 29 is driven by shaft 28, wheels 22, axles 24 and cups 25, from sprocket 26.

The sprocket 26 is driven by shaft 27, sprocket 59, chain 60, sleeve 61, gear 62 and pinion 63, the latter being mounted on shaft 64, which is driven by pulley 65 with belt 66 from pulley 9. Sleeve 61 is loose on shaft 107 and is engaged and disengaged by sleeve 67, connection being made by teeth 68 engaging teeth 69, the sleeve 67 being moved into and out of engagement by lever 7 O.

The rotary scraper 71 is provided with rigid scraping edges 72, is mounted on shaft 64 and is driven thereby.

It is obvious from the foregoing that the rotary scraper may be started from the engine 7 with the sleeve 67 disengaged, and that by engaging the latter with the bar 70 thecups 25 will be started, and that mate- 'rial placed in the cups from the hopper 34 will be carried under the roller 39, where it will be compacted. As the material advances toward the rotary scraper 71 it is cut to an even depth by scraper 4S and that which is removed passed to the elevator 50, by moldboard 49, this surplus being carried to the hopper 34, from where it may again be placed in the con\ eyer cups Shaft 64 of the rotary scraper 71 is journaled in the yoke 106, which is pivoted to swing on shaft 107 and rests on adjustable screws 108, screw threaded in housings 44, so that when a large stone or other hard substance reaches the scraper it will lift by reason of the edges 72 striking the stone and allow the latter to pass, after which the rotary scraper will drop down to normal position, where the edges 72 run close to the bottom of the cups as shown in Fig. The weight of the rotary scraper is slightly more than sufficient to hold it in working position, so that a large stone raises it and passes through and the scraper drops down with no apparent injury and only a slight noise occasioned by the edges 72 striking the stone.

The asphalt or binder is supplied by the cups T3, attached to chain 74, running on sprockets 75 and 76, mounted onshafts 77 and 78 respectively, which are journaled in frame 79 and inserted in the casing 80, the

latter being so located with reference to melting tank 10 that cups 73 will dip into the melted asphalt, and the casing being provided with cover 81 for the purpose of inspecting the cups. The shaft 77 extends outside the casing and is provided with sprocket 8:2, which may be exchanged for other sizes to regulate the amount of asphalt delivered by the cups 73, the sprocket 82 being driven by chain 83 from sprocket 84 mounted on shaft 29.

As the binder is delivered from the cups 73 by gravitation it falls in chamber 85 and flows by gravity down the spout 86 and into the runway 87, where it is gathered by the projections 88, the edges 72 first striking the binder. Projections 88 of the rotary scraper T1 carry the binder downward and strike the material with the binder clinging to them, a small portion of the material being removed by each projection which brings the material and binder together and instantly completes the mixture, the latter being discharged by centrifugal force against and between the rollers 93 and 96 as the projections 88 pass upward from the lowermost part of their travel.

To the legs 16 are secured brackets 89, to which in turn is pivoted bracket 90 by pins 91, the shaft 92 being journaled in brackets 89 and provided with roller 93 and sprocket 94, both of which are rigidly mounted on the shaft, while shaft 95 is journaled in bracket 90 and provided with roller 96 and sprocket 97 which are rigidly mounted on the shaft. Scrapers 98, of usual construction, are provided to scrape the rolls 93 and 96 and remoye any adhesive material that would otherwise cling to the rolls and prevent their successful operation.

The rolls 93 and 96 are driven by sprockets 94 and 97 respectively, by chain 99 from sprocket 100, the latter being mounted on shaft 64, and the idler 101 is journaled on the pin 102 secured by rocker arm 103 and held in tension by spring 104 provided to keep the chain 99 in working tension.

The object of the rolls 93 and 96 is to knead the material after it leaves the rotary scraper 71, and to more thoroughly set the binder to the material so that it will not shrink therefrom as the mass cools. These rolls 93 and 96 are very advantageous in mixing earthy products, as soil and the like, but are not essential in mixing sand .and asphalt or asphaltic concrete.

Burner 105 is shown in Figs. 3 and 5 for the purpose of heating the projections 88,

which is very advantageous in working wet and sticky soil, the heat preventing such ma terial from clinging to the projections. This burner is not essential in the mixing of sand and asphalt or asphaltic concrete.

It will be understood from the foregoing that no skill is required to fill the cups with material from the hopper 34, that the roller 39 will compact the material in the cups, and that the scraping edge 48 and moldboard 49 comprise a plow which will remove from the conveyer all material above a certain easily regulated depth, the material reaching the rotary scraper 71 in a regular and easily determined continuous quantity; also as long as the cups 73 dip in the binder, a regular and easily determined continuous quantity will be delivered to the rotary scraper; and that, owing to the provision for changing sprocket 82 for other sizes, any ratio may be positively maintained between the quantity of material and quantity of binder delivered to the rotary scraper 71.

The present machine has made satisfactory mixtures of soil and asphalt for public highway without the rolls 93 and 96, but it is found that less binder may be used to produce satisfactory work with earthy material when the material is passed between the rolls as it leaves the rotary scraper 71. lVhen mixing asphaltic concrete, the roller 39n1ay be removed from the machine, although it is of no disadvantage even in this work.

The machine is of chief importance for the mixture of all kinds of asphaltic and other binders with all kinds of paving products, but may be advantageously employed for the mixture of other water proofing and for material for railway beds and the like.

Having described my invention, what I claim as new and desire to secure by Letters Patent is 1. In paving mixing machines the combination of a traveling conveyer, a hopper arranged to supply said conveyer with material, a roller arranged to roll material in said conveyer, a rotary scraper arranged above said conveyer. and means to deliver binder to said conveyer.

2. In paving mixing machines, the combination of a traveling conveyer arranged to receive material, and a scraper arranged to remove a portion of the material from said conveyer for the purpose of regulating the quantity of material remaining in said conveyer. a rotary scraper arranged to scrape material from said conveyer, and means to deliver binder to said material and rotary scraper.

3. In paving mixing machines, the combination of a traveling -:onveyer. a hopper arranged adjacent to said conveyor, a roller arranged to compact material in said conveyer, a scraper arranged to scrape material in said conveyer to a certain depth, a conveyer arranged to convey the material removed by said scraper to said hopper, a rotary scraper arranged to scrape material from said conveyer, and means to supply binder to said scraper.

4. In paving mixing machines, the combination of a traveling conveyer, a rotary scraper arranged to scrape material from said conveyer, means to deliver binder to said scraper, said rotary scraper journaled in a swinging yoke so pivoted as to allow said rotary scraper to rise when the scraping edges of said scraper strike material they will not cut.

5. In paving mixing machines, the combination of a traveling conveyer, a rotary scraper arranged to scrape material from said conveyer, means to deliver binder to said scraper, and said rotary scraper journaled in journal boxes that will allow said scraper to move away from and toward said conveyer.

6. In paving mixing machines, the combination of a traveling conveyer, a rotary scraper arranged to scrape material from said conveyer, means to carry binder to said scraper, a pair of rolls arranged to,receive material as it leaves said rotary scraper, and

said rolls arranged to roll and discharge said material.

7 In paving mixing machines, the combination of a traveling conveyer, means by which said conveyer may be supplied with material, a rotary scraper arranged to scrape material from said conveyer, and a plow arranged in said conveyer to regulate the quantity of material delivered to said r0- tary scraper.

S. In paving mixing machines, the combination of a traveling conveyer, means to compact material in said conveyer, a rotary scraper arranged to scrape material from said conveyer, and means to supply binder to said scraper.

IVILLIAh I F. DAVIS.

l Vitnesses BEULAII I. KIRKPATRICK, MILTON P. DAVIS. 

